Ship construction



R. W. DAVIS.

SHIP CONSTRUCTION.

APPLICATION FILED JULY 23. 1918.

Patented Jul 22, 1919.

2 SHEETS-SHEET i.

R. w. DAVIS. SHIP CONSTRUC'HON. APPLICATION FILED JULY23. I918.

2 SHEETS-SHEET 2.

ROBERT WILLIAM Davis, on I-YIILTONIA, NEW JERSEY.

SHIP CONSTRUCTION.

Specification of Letters Patent.

Patented J n15 22, 1919.

App1ication filed July 23, 1918. Serial No. 246,302.

To all whom it may concern:

Be it known that I, Bonner \VILLIAM DAVIS, a citizen of the United States, residing at I-iilt onia, in the county of Essex and State of New Jersey, have invented certain new and useful Improvements in Ship Construction, of which the following is a full, clear, and exact specification.

This invention relates to ship construction and has for its object to produce a ship which may be cheaply built and which will not pitch so much in the sea as the ordinary type of ship having a U-shaped cross section forward and a V-shaped cross section aft. Another obj ectis to increase the cargo capacity of the ship.

The invention will be first hereinafter described in connection with the accompanying drawings, which constitute part of this specification, and then more specifically definedin the claims at the end of the description.

J y In the accompanying drawings, wherein Fig. 1, drawn to a larger scale.

Fig. 5 is a section on the line V;V of Fig. 1 drawn to the same scale as Fig. 4, and

Fig. 6 is a section on the line VI-VI of Fig. 1. i i

The entire bottom 1 of the vessel is flat,

and the sides are straight up and down at all points making substantially right angles with the bottom, so that the floor 2 is substantially the same area as the deck 3. The sides of the hull are also straight in a horizontal plane amidships, as at 4 in Fig. 1, but said sides converge at 5 to the prow and at 6 to the stern. These converging portions 5 and 6 of the sides of the hull are also straight up and down, as shown in Figs. 4 and 5. This makes a cheap construction permitting the use of straight rolled I-beams or channel sections 7 and 8 for the vertical and transverse framework instead of expensive and elaborate bent and builtup framework.

The only bend in the framework of the present construction is in the longitudinal members 9 which may be of channel formation, as shown in Figs. 4 and 5, or of any other suitable shape, and which are bent from the planes of the parallel portions at to the planes of the converging portions 5 and 6 of the sides of the hull. As this bend is only in the horizontal plane, it is simple and inexpensive to make.

As illustrated, the hull is fitted with twin propellers 10 at the prow, the axes of said propellers being preferably arranged parallel to the adjacent converging portions 5 of the sides. The driving shafts 10 for said propellers are inclosed in elliptical casings 11,. as best illustrated in Fig. 6, the greater axis of each of said casings being in a horizontal plane, and the lateral edges of said casings terminating in sharp edges 12. This construction reduces friction of the water against the casings 11 and adds stability to the ship.

The stability of the vessel is further and to a greater extent increased by the provision of auxiliary shell plates 13 on the outside and at the bottom of the converging portions 5 and 6 of the sides of the hull. The ships bottom 1 is extended out to the outer edges of said shell plates 13, as at 14, Figs. 1 and 5, and the space between the vertical sides and the plates 13 may be filled with concrete 15, or other suitable filling material, or said plates 13 otherwise braced.

Each of the auxiliary shell plates 13 extends from the point of the prow or stern to the-points where the converging portions 5 and 6 of the sides of the hull merge into the parallel portions l of said sides. The upper edgeli'l of each plate 13 is some distance above, and the curve in said plate begins in the horizontal plane of the axes of the propellers which are both on the same level. Adjacent the propellers the plates 13 are curved substantially parallel to the arc of the movement of the outer ends of the propeller blades, but at either end said plates, as they near the point of the prow or stern or the juncture of the converging portions with the parallel portions of the sides of the hull, become gradually changed in curvature, the chords of said curves becoming more nearly vertical, as suggested by the dotted chords 16 and 17 in Figs. 1 and 5', until the curves disappear entirely and the ends of the plates 13 become vertical.

It will be understood that the auxiliary shell plates 13 at the stern of the ship, adjacent the rudder 18, are similarly formed.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is l. A ships hull having the middle portions of its sides vertical and its end portions converging to the prow and stern, a flat bottom having extensions projecting outwardly beyond said converging sides, plates arranged along said converging sides and extending downwardly and outwardly therefrom to the outer edge portions of said extensions of the bottom, and a filling of reinforcing material. behind said plates.

2. A ships hull having a flat bottom and the ends of its sides converging to the prow, said bottom having extensions projecting outwardly from the converging end portions of the sides, and curved surfaces extending along said extensions of the bottom from the edge portions thereof to the converging portions of the sides of the hull, the curved Surfaces having their ends gradually merging into the vertical prow and the vertical middle portions of the sides of the hull.

3. A ships hull having a flat bottom and the ends of its sides converging to the prow, said bottom having extensions projecting outwardly from the converging end portions of the sides, and curved surfaces extending along said extensions of the bottom from the edge portions thereof to the converging portions of the sides of the hull, the curve of the middle portions of said surfaces having its chord at a greater angle to the vertical than the chords of the curve of the end portions of said surfaces.

4:. A ships hull having a fiat bottom and the middle portions of its sides parallel,the ends of said sides converging to the prow and stern, said bottom having extensions projecting outwardly from the converging end portions of the sides, and curved plates extending along said extensions of the bottom from the edge portions thereof to the converging portions of the sides of the hull, the curve of said plates changing gradually from the central portions of the plates to their ends which are vertical where they merge into the prow or stern and the parallel portions of the sides of the hull, the chords of the curves at points between the central and end portions of the plates becoming nearer the vertical as they approach said ends of the plates.

5. A ships hull having the end portions of its sides converging to the prow, a flat bottom, propellers arranged outside said converging portions of the sides at one end, the axes of the'propellers being substantially parallel to the adjacent converging end portions of the sides of the hull, curved surfaces extending along the converging end portions of the sides and projecting outwardly from said side portions below the propellers, and outward extensions of the flat bottom meeting the outer edges of said curved surfaces.

6. A ships hull having the end portions of its sides converging to the prow and stern, the upper portions of said converging ends being vertical, propellers disposed beyond said vertical portions at one end of the hull, and plates arranged along said converging portions of the sides and extending outwardly and downwardly from the lower edges of said vertical portions, said plates being curved to conform to the arc of movement of the propellers adjacent same and extending to points under the axes of said propellers.

7 A ships hull having the end portions of its sides converging to the prow, the upper portions of said converging ends being vertical, propellers disposed beyond said vertical portions at one end of the hull, and plates arranged along said converging ,portions of the sides and extending outwardly and downwardly from the lower edges of said vertical portions below the propellers.

In testimony whereof I have signed my name 'to this specification.

ROBERT WILLIAM DAVIS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

